A vulnerability was found in Pivotal Concourse up to 4.2.1. It has been rated as critical. This issue affects an unknown code block of the component Login Flow. The manipulation with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Pivotal Concourse Release, versions 4.x prior to 4.2.2, login flow allows redirects to untrusted websites. A remote unauthenticated attacker could convince a user to click on a link using the oAuth redirect link with an untrusted website and gain access to that user's access token in Concourse.

The bug was discovered 12/17/2018. The weakness was published 12/19/2018 (Website). The advisory is shared at pivotal.io. The identification of this vulnerability is CVE-2018-15798 since 08/23/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1204.001 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 4.2.2 eliminates this vulnerability.

Similar entry is available at VDB-155239.

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Vendor

• Pivotal

Name

• Concourse

Version

• 4.2.0
• 4.2.1

License

• commercial

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CPE 2.2info

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